August 10, 2006Clinical Genetics

Spectrum of pathogenic mutations and associated polymorphisms in a cohort of 44 unrelated patients with long QT syndrome

Q: What is the clinical evidence from this study?

Study design: Observational. Population: Long QT syndrome (n=44). Intervention: Genetic analysis (denaturing high-performance liquid chromatography). Primary outcome: Identification of disease-causing mutations and SNPs.

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Key result

Genetic analysis of 44 unrelated patients with long QT syndrome identified 45 disease-causing mutations, with 84% showing a complex molecular pattern of mutations associated with several SNPs.

Population

44 unrelated patients with long QT syndrome

Design

Cohort

Authors

GMGilles MillatUniversité Claude Bernard Lyon 1 PCPhilippe ChevalierUniversité Claude Bernard Lyon 1 LRLioara Restier‐MironHôpital Louis Pradel

Discussion

Member takes

Implication

May complicate LQTS genetic counseling; extends models of variable penetrance via SNP interactions.

Key Points

To characterize the spectrum of pathogenic mutations and associated polymorphisms in patients with long QT syndrome (LQTS).
Analyzed genetic data of 44 unrelated LQTS patients using denaturing high-performance liquid chromatography.
Focused on mutations in the KCNQ1, KCNH2, SCN5A, KCNE1, and KCNE2 genes.
Identified both disease-causing mutations and common SNPs present in LQTS-causing genes.
Identified 45 disease-causing mutations, including 24 novel mutations, in the patient cohort.
84% of patients exhibited complex molecular patterns with multiple associated SNPs.
Several patients carried more than one mutation, highlighting genetic variability.

Study Design

Type

Observational (n=44)

Structured PICO

Population

44 unrelated patients with long QT syndrome

Intervention

Denaturing high-performance liquid chromatography analysis of the KCNQ1, KCNH2, SCN5A, KCNE1 and KCNE2 genes

Outcome

Molecular pattern of pathogenic mutations and associated polymorphismssurrogate

The study highlights the complex genetic landscape of long QT syndrome, demonstrating that most patients harbor a combination of pathogenic mutations and multiple SNPs that may modulate clinical expression.

Cite This Study

Millat et al. (2006) conducted an observational in Long QT syndrome (n=44). Genetic analysis (denaturing high-performance liquid chromatography) was evaluated on Identification of disease-causing mutations and SNPs. Genetic analysis of 44 unrelated patients with long QT syndrome identified 45 disease-causing mutations, with 84% showing a complex molecular pattern of mutations associated with several SNPs.

synapsesocial.com/papers/6a178bd65fdf2a7b88aa1f99 https://doi.org/10.1111/j.1399-0004.2006.00671.x

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Spectrum of pathogenic mutations and associated polymorphisms in a cohort of 44 unrelated patients with long QT syndrome

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

Spectrum of pathogenic mutations and associated polymorphisms in a cohort of 44 unrelated patients with long QT syndrome

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

Also Consider

Also Consider